To provide a fire alarming system capable of finely detecting an alarm issuing state of equipment connected on the same channel even in a P type fire alarming system and of performing fine fire alarming corresponding to fire conditions.
This fire alarming system 100 is provided with a part composed by connecting plural sensors 3 for issuing alarms based on fire sensing on the same channel wherein an address is not assigned to the sensors 3. The system 100 is further provided with a reception circuits 14 for discriminating signals appearing on the channel at the time of issuing an alarm and an alarm issuing state judgement means 11 for judging at least the alarm issuance of one sensor and the alarm issuance of two or more sensors based on the discrimination of the signal discrimination means of the reception circuits 14.
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SAKURAI KAZUYOSHI
HIRONO MITSUTOSHI
